FiiO K9 Pro ESS DAC and Headphone Amp

Experience Audiophile-Grade Performance with the FiiO K9 Pro ESS Desktop DAC and Headphone Amplifier
The FiiO K9 Pro ESS redefines desktop audio with its cutting-edge technology and versatile connectivity options, delivering unparalleled sound quality for audiophiles and music enthusiasts. Equipped with dual ES9038PRO DAC chips, the K9 Pro ESS offers an exceptional listening experience with support for PCM up to 384 kHz/32-bit and native DSD256 decoding. Whether you're streaming from a computer, smartphone, or digital music player, this high-fidelity DAC ensures rich, detailed audio with minimal distortion.
Dual ES9038PRO DACs for Superior Sound Quality
The K9 Pro ESS features two ES9038PRO DACs, with each chip dedicated to a single channel for a fully balanced audio architecture. This setup ensures that every note, nuance, and detail is faithfully reproduced. Thanks to the THX AAA 788+ amplifier, the K9 Pro ESS provides an impressive output of 2100mW at 32 ohms, capable of driving headphones ranging from 16 to 600 ohms. This makes it ideal for powering a variety of headphones, from sensitive in-ear monitors to high-impedance over-ear models.
Comprehensive Connectivity Options
Designed to integrate seamlessly into any audio setup, the K9 Pro ESS offers a wide array of input and output options. It includes USB-B, USB-C, coaxial, optical, RCA, and 4.4mm inputs, as well as 3-pin XLR and RCA line outputs. For headphone enthusiasts, the device features  single-ended 1/4-inch, 4.4mm balanced, and balanced 4-Pin XLR headphone jacks. The K9 Pro ESS acts as the ultimate bridge between your devices, ensuring effortless compatibility with your existing gear.
Precision Volume Control and Customization
The K9 Pro ESS employs a 120-step ADC curve reconstruction volume adjustment system that delivers precise volume control with zero channel imbalance. Its RGB indicator lights provide an intuitive way to monitor the playback sample rate and format. Additionally, the FiiO Control app allows you to tweak settings such as filter selection and channel balance, providing full customization to match your preferences.
Bluetooth 5.0 with Hi-Res Codec Support
The built-in Qualcomm QCC5124 Bluetooth chip enables the K9 Pro ESS to support high-resolution codecs like LDAC, aptX HD, and aptX Adaptive. This ensures low-latency, high-quality wireless audio for streaming from your Bluetooth-enabled devices. Whether you're gaming, watching movies, or listening to music, the K9 Pro ESS guarantees a seamless and immersive experience.
Robust Build and Efficient Heat Management
Crafted with an all-aluminum chassis, the K9 Pro ESS combines durability with elegant aesthetics. The included custom stand not only saves desk space but also enhances heat dissipation, ensuring optimal performance during extended listening sessions. With a robust linear power supply featuring four 4700uF capacitors, the device delivers clean, stable power for consistent sound quality.

Technical Specifications



Feature
Details




DAC Chips
Dual ESS ES9038PRO


Amplifiers
Dual THX AAA 788+


Supported Audio Formats
PCM: Up to 384 kHz/32-bit; DSD: Native DSD64, DSD128, DSD256


MQA Support
Full MQA decoding and rendering


Inputs
USB-B, USB-C, Coaxial, Optical, 4.4mm TRRRS, Stereo RCA


Outputs
RCA Line, 3-pin Balanced XLR Line, 4.4mm Balanced , 4-Pin Balanced XLR, 1/4" TRS


Bluetooth Version
5.0


Bluetooth Codecs
SBC, AAC, aptX, aptX HD, aptX Adaptive, aptX LL, LDAC


Frequency Response
20Hz - 50kHz (±0.3dB for Line Out)


Headphone Output Power
2.1W @ 32Ω, 1.1W @ 300Ω, 281mW @ 600Ω (Balanced)


Signal-to-Noise Ratio
≥ 129dB (1/4"), ≥ 128dB (XLR), ≥ 123dB (Balanced)


THD+N
< 0.00025% (XLR), < 0.00033% (Headphone, 1/4")


Dynamic Range
128dB (XLR), 127dB (1/4" Headphone Out)


Impedance Range
16Ω to 600Ω


Volume Control
120-Step ADC Curve Reconstruction


Power Supply
Linear Power Supply with Low-Noise LDOs and Four 4700uF Capacitors


Dimensions
8.8 x 7.9 x 2.8 in (224.5 x 200 x 72 mm)


Weight
6.1 lbs (2.8 kg)


RGB Indicator Lights
Yes; Display Sample Rate and Playback Format


App Support
FiiO Control App for EQ, Filters, and System Settings


Construction
CNC Machined Aluminum Chassis




What's In the Box

FiiO K9 Pro ESS Desktop DAC and Headphone Amplifier
Custom Stand
Power Cable
USB-B to USB-A Cable
Bluetooth Antennae
1/4-Inch Headphone Adapter
Limited 1-Year Manufacturer Warranty


The FiiO K9 Pro ESS delivers an impeccable blend of modern features, precise engineering, and audiophile-grade sound. Whether you’re using headphones, speakers, or both, this desktop DAC and amplifier offers unmatched performance for your listening needs. Available now on Headphones.com.